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Crews were responding to a large brush fire that broke out in a forested area west of Agua Dulce Wednesday, officials said.

The blaze, dubbed the Rowher Fire, broke out around 2:45 p.m. near Sierra Highway and covered an estimated 400 acres by 5 p.m., according to the the Los Angeles County Fire Department.

It was 0% contained as of 3:45 p.m., Angeles National Forest officials said.

Water-dropping helicopters and air tankers were assisting in the firefight.

No structures were immediately threatened, officials said.

The flames were spreading in roughly 70-degree weather with relative humidity above 30%, according to the National Weather Service — which is not considered critical fire weather.

Gusts in the area weren’t too strong, reaching an estimated 18 mph in valleys but 35 mph at mountain peaks, forecasters said.

The winds were pushing smoke toward the northeast, and a blanketing could be seen over Lancaster, NWS said.